None, other than they're fat, numb, and can be ugly.
That said, the current new BMW I'd be most likely to consider is actually the i4 M50. Might as well have the performance if all the traidtional BMW traits are no longer present, it's a reasonable size, and has reasonable utility. Don't see the buck teeth from the driver's seat, and not bad around BMW's UDE mini course.
I tend to keep my vehicles long term, so any complexity that adds more risk, or potential cost down the line isn't something I embrace. Have a front-end boo-boo now, and you're not only replacing a radiator or condensor, but also an intercooler, and an aux radiator. Li-ion batteries have finite lives, and that will have to be replaced at some point, but probably not before tripping warning lights/messages, whether true or false.
But that's not unique to BMW, and pretty much the nature of the game nowadays. I prefer old school analog BMWs, and the people in that group I know of have held onto their old cars, buy used ones that still reasonably resemble them, or have fled to other marques, like used P-cars, if looking for performance.